(1) 简单介词：about, after, before, but, by, for, in, like, near, under, up等。 (2) 复合介词(由两个介词组成)：inside, into, throughout, upon, within, without等。 (3) 短语介词(由短语构成)：according to, apart from, except for, for the sake of, in case of, inpite of, in view of, on...
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